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Regulations for Emissions from Vehicles and Engines
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Final Rule for Procedures for Testing Highway and Nonroad Engines and Omnibus Technical Amendments

Final Rule for Procedures for Testing Highway and Nonroad Engines and Omnibus Technical Amendments
Basic Information
Code of Federal Regulations Citations
  • 40 CFR Part 85
  • 40 CFR Part 86
  • 40 CFR Part 89
  • 40 CFR Part 90
  • 40 CFR Part 91
  • 40 CFR Part 92
  • 40 CFR Part 94
  • 40 CFR Part 1039
  • 40 CFR Part 1048
  • 40 CFR Part 1051
  • 40 CFR Part 1065
  • 40 CFR Part 1068

On this page:

  • Rule Summary
  • Rule History
  • Additional Resources

Rule Summary

The U.S. Environmental Protection Agency (EPA) is revising the procedures for testing various categories of nonroad engines. We are also applying these same procedures to heavy-duty highway engines. This common set of test requirements is intended to streamline laboratory efforts for EPA and industry and to form the basis for internationally harmonized test procedures for nearly all categories of engines. This final rule also covers a wide range of amendments to EPA regulations for most highway and nonroad sectors.

  • Final Rule (PDF)(194 pp, 7.5 MB, published July 13, 2005)
  • Technical Support Document & Summary and Analysis of Comments (PDF)(115 pp, 712 K, EPA-420-R-05-008, published June 2005)

Rule History

  • Proposed Rule and Related Materials

Additional Resources

Fact Sheet

  • Changed Test Procedures for Nonroad Engines and Heavy-Duty Highway Engines (PDF)(4 pp, 125 K, EPA-420-F-05-036, July 2005)
  • Regulations for Emissions from Vehicles and Engines Home
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Last updated on June 13, 2022
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